多項(xiàng)選擇題All secure domain routers （SDRs） have shared attribute and resources. Which three resources are sharedall SDRs？ （）

A.privilege-level configuration
B.fabric cards
C.SNMP traps
D.admin- level configuration
E.exec- level configuration


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1.單項(xiàng)選擇題Which statement about VPLS is true？（）

A.All CE devices emulate a bridge
B.All provider devices emulate a bridge
C.Hierarchical VPLS reduces signaling overhead
D.Each PE device emulates a bridge
E.Each CE device emulates a bridge

3.單項(xiàng)選擇題Which statement is FALSE concerning Concatenation？（）

A.It allows ITCM to send multiple upstream packets in one single large burst.
B.It reduces upstream data throughput.
C.It can be enabled/disabled from CMTS on per upstream port basis if desired
D.Concatenation activity on an interface can be checked by the show controller counters command

4.單項(xiàng)選擇題In optical transmission systems， chirped lasers are used for the purpose of：（）.

A.Turning the laser to a specific ITU channel
B.Keeping the signal wavelength "locked" to a specific technology
C.Suppressing FWM and SBS non-linear effects
D.None ofthe above

5.單項(xiàng)選擇題What layer of the TMN （telecommunications management network） model does CTM fit into？（）

A.Network management layer
B.Element management layer
C.Business management layer
D.Network element layer